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Anesthesia for Neurosurgery (Part II)

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Anesthesia for Neurosurgery (Part II) Review Article DOI: 10.18231/2394-4994.2018.0058 Anesthesia for neurosurgery (Part II) Lalit Gupta1, Bhavna Gupta2,* 1Assistant Professor, 2Senior Resident, Dept. of Anaesthesia, Maulana Azad Medical College and Lok Nayak Hospital, New Delhi, India *Corresponding Author: Email: [email protected] Received: 9th February, 2018 Accepted: 12th February, 2018 Abstract The central nervous system (CNS) deserves special consideration in the perioperative setting for several reasons for an anesthetist. An understanding of neuroanatomy is essential because neuro anesthesia continues to develop and evolution of neurosurgical practice is accompanied by new challenges for the anesthetist. Basic knowledge and expertise of the neuro-anesthetist can directly influence patient outcome. With the recent advancement in functional and minimally invasive procedures, there is an increased emphasis on the provision of optimal operative conditions, preservation of neurocognitive function, minimizing interference with electrophysiological monitoring, and a rapid, high-quality recovery. So, during neuro anesthesia, anesthesiologist needs to know physiology of CNS including cerebral metabolism and cerebral blood flow. Neuro anesthesia can be challenging, because sometimes apparently contradictory demands must be managed, for example, achieving optimal conditions for neurophysiological monitoring while maintaining sufficient anesthetic depth, or maintaining oxygen delivery to neuronal tissue and simultaneously preventing high blood pressures that might induce local bleeding. One of the peculiarities of neuro anesthesia has always been that as much importance is attached to wakening the patient as sending them to sleep. We have included the anesthesia for neurosurgery in two parts. In the first part, we had discussed cerebral anatomy, physiology and intracranial pressure, in the second part we have included anesthesia considerations for surgery for brain tumor, aneurysmal surgery, temporal lobe surgery, trans sphenoidal surgery and traumatic brain injury. Keywords: Anesthesia, Neurosurgery. Introduction 10.18231/2394-4994.2018.0001), we had discussed The central nervous system (CNS) deserves special cerebral anatomy, physiology and intracranial pressure, consideration in the perioperative setting for several in the current second part we have included anesthesia reasons for an anesthetist. An understanding of considerations for surgery for brain tumor, aneurysmal neuroanatomy is essential because neuro anesthesia surgery, temporal lobe surgery, trans sphenoidal surgery continues to develop and evolution of neurosurgical and traumatic brain injury. practice is accompanied by new challenges for the anesthetist.1 Basic knowledge and expertise of the neuro- Common Surgical Procedures anesthetist can directly influence patient outcome. With Neurosurgery is a complex surgery because every the recent advancement in functional and minimally part of the brain undergoing surgery needs some special invasive procedures, there is an increased emphasis on consideration apart from general principles of the provision of optimal operative conditions, management. preservation of neurocognitive function, minimizing Surgery for Brain Tumors1-3 (Table 1) interference with electrophysiological monitoring, and a 1. The fundamental anesthetic considerations in tumor rapid, high-quality recovery.2,3 So, during neuro surgery are proper positioning of the patient to anesthesia, anesthesiologist needs to know physiology of facilitate the surgical approach; providing adequate CNS including cerebral metabolism and cerebral blood relaxation of the brain to optimize surgical flow. Neuro anesthesia can be challenging, because conditions; and preventing well-known devastating sometimes apparently contradictory demands has to be complications, such as venous air embolism. managed, for example, achieving optimal conditions for 2. Preoperative assessment of the level of neurophysiological monitoring while maintaining consciousness (Glasgow Coma Scale, GCS) (Table- sufficient anesthetic depth, or maintaining oxygen 2) and a review of relevant radiologic studies should delivery to neuronal tissue and simultaneously be performed, and the results should be taken into preventing high blood pressures that might induce local consideration in the anesthetic plan. bleeding.2 One of the peculiarities of neuro anesthesia 3. Adequate brain relaxation is typically achieved with has always been that as much importance is attached to a standard anesthetic, including sub-MAC volatile wakening the patient as sending them to sleep. We have anesthesia, an opioid infusion, mild to moderate reviewed the anesthesia for neurosurgery in two parts. In hyperventilation, and Mannitol. the first part (Anesthesia for Neurosurgery (Part I) (DOI: Indian Journal of Clinical Anaesthesia, July-September, 2018;5(3):299-305 299 Lalit Gupta et al. Anesthesia for neurosurgery (Part II) Table 1: Management strategies Protocol Management Strategy Preoperative 1. Note and record the GCS of patient 2. Avoid sedatives / anxiolytics if patient is drowsy or ICP is raised Positioning and Monitoring Sitting: 1. Standard ASA monitoring, CVP line and Precordial Doppler if possible( for VAE) 2. Prone / semi recombinant: 3. Standard ASA monitoring, Foley catheter and arterial line if surgery demands. Intraoperative Induction: 1. Etomidate / Thiopentone or Propofol with intubation under deep anaesthesia to avoid increase in ICP. 2. Maintainace: 3. Minimize ICP and maintain adequate CPP. 4. Opioid and/or volatile anesthetic (isoflurane is preferred) with or without nitrous oxide. 5. Avoid intraoperative long acting muscle relaxants if motor function is tested. 6. Mannitol (0.25-1 g/kg IV) also can be given before opening of dura. 7. Maintain euvolemia and normocapnia if normal ICP; temporary hyperventilation for relaxing brain if required. tight Postoperative 1. Avoid coughing, straining during extubation by prior use of lignocaine or small dose of opioid. 2. Always note and Record postoperative GCS Glasgow Coma Scale (GCS)4,5: GCS is a neurological professors of neurosurgery at the University of scale which aims to give a reliable and objective way of Glasgow's Institute of Neurological Sciences at the city's recording the conscious state of a person for initial as Southern General Hospital. It has following point scale well as subsequent assessment. The scale was published system: in 1974 by Graham Teasdale and Bryan J. Jennett, Table 2: Glasgow coma scale 1 2 3 4 Eye (E) Opens eyes to Does not open Opens eyes to painful Opens eyes verbal eyes stimulus spontaneously commands Verbal(V) Makes Oriented Makes no Speaks Confused and incomprehensible and talks sound incoherent words disoriented sounds normally Motor(M) Abnormal Extension to painful flexion to painful Flexion / Localizes to Obeys No movement stimuli (decereberate stimuli Withdrawal to painful commands posture) (decorticate painful stimuli stimuli posture) The GCS for intubated patients is scored out of 10 as the neurological signs and altered level of sensorium or verbal component falls away neck rigidity. Generally, brain injury is classified on the basis of 2. Surgical or endovascular intervention is required to GCS score (E+V+M) as: prevent hemorrhage in patients who survive 1. Severe, GCS < 8–9 (In trauma, a GCS of 8 or less hemorrhage to prevent further re-bleeding. indicates a need for endotracheal intubation) 3. Patients with Sub arachnoid hemorrhage due to 2. Moderate, GCS 9–12 aneurysm are at risk of many complications which 3. Minor, GCS ≥ 13 include cardiac dysfunction, neurogenic pulmonary edema, hydrocephalus as well as hemorrhage from Cerebral Aneurysm Surgery 2,6,7 (Table 3) the aneurysm. 1. The intracranial aneurysm is the most common 4. Triple H therapy is the modality of treatment of cause of intracranial hemorrhage. The most vasospasm. Triple H therapy includes common manifestation is sudden onset of severe hypervolumia, hypertension and hemodilution. headache, with nausea and vomiting and focal Nimodipine, a type of calcium channel blockade Indian Journal of Clinical Anaesthesia, July-September, 2018;5(3):299-305 300 Lalit Gupta et al. Anesthesia for neurosurgery (Part II) decreases the overall morbidity and mortality risk Temporary clipping time should be less than 10 minutes from vasospasm. to avoid risk of ischemia. Effect of hypothermia (32-25○ 5. The major causes of morbidity and mortality from C) is confounded by various factors which include grade SAH include rebleeding, ischemic cerebal injury, of SAH, time of clip application, neuroprotective agents, infarction and development of hydrocephalus and anesthetic agents, surgeon experience and intraoperative seizures. repair of aneurysm. Table 3 Protocol Management Strategy Preoperative 1. Note and record the GCS of patient 2. History of hypertension, CAD, DM 3. Patient is often on calcium channel blockers. 4. ECG changes may mimic with cardiac event (T-wave inversions, U waves, ST-segment depressions, prolonged QT interval, and rarely Q waves) 5. No sedation (may raise PCO2) Positioning and 1. Supine: the best surgical exposure is related to specific head positions. The proper Monitoring angle of microscopic view may minimize neurovascular injury and brain retraction. 2. Standard ASA monitoring, Foley catheter and arterial line if surgery demands (HT/CAD). Intraoperative Induction: 1. Opioid plus propofol and/or volatile anesthetic. 2. Avoid increases in systemic blood pressure (to prevent rebleeding).
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